<template>
  <div>
    <div v-show='isShow'>全场清仓，全部5折</div>

    <ul>
      <li v-for='item in goods' :key='item.name'>
        <div>{{item.name}}</div>
        <div>{{item.price}}</div>
        <div>折扣：{{ discountDefault}}</div>
      </li>
    </ul>

    <input type="text" v-model=' discountDefault'/>

    <h4>总价{{ totalPrice}}</h4>

    <button @click='priceData'>点击开启促销活动</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      goods: [
        {
          name: 'mac电脑',
          price: 15000,
        },
        {
          name: '百事可乐',
          price: 3,
        },
        {
          name: '保温杯',
          price: 99,
        },
        {
          name: '保暖手套',
          price: 130,
        },
      ],
      isShow: false,
      discountDefault: 0.5,
    }
  },
  methods:{
    priceData(){
      this.goods.forEach(item => item.price = item.price * this.discountDefault)
       this. isShow = true
    }

  },
  computed:{
    totalPrice(){
       return  this.goods.reduce((prev,item) =>{
           return prev + item.price
       },0)
    }
  }
}
</script>

<style scoped>
ul {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
  width: 200px;
  height: 80px;
  padding: 10px 0 0 0;
  border: 2px solid #333;
}
</style>